0.5 mole solute is present in 250 g solvent. What is the molality?
Answer and explanation
Correct answer: 2.0 mole per kilogram
Molality is defined as moles of solute per kilogram of solvent, so the solvent mass must be converted to kilograms. The given 250 g equals 0.250 kg. Hence molality = 0.5 mol/0.250 kg = 2.0 mol kg⁻¹. Option A is correct. Using solution volume would calculate molarity, and failing to convert grams to kilograms would produce an incorrect result.
Frequently asked questions
What is the correct answer to this question?
2.0 mole per kilogram
Why is this the correct answer?
Molality is defined as moles of solute per kilogram of solvent, so the solvent mass must be converted to kilograms. The given 250 g equals 0.250 kg. Hence molality = 0.5 mol/0.250 kg = 2.0 mol kg⁻¹. Option A is correct. Using solution volume would calculate molarity, and failing to convert grams to kilograms would produce an incorrect result.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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